lindee



4 Sheets-Sheet l Feb. 7, 1956 c. F. LINDEE, JR

COMBINATION LATHE AND DRILL PRESS Filed Nov. l0, 1953 Carl .E .Zinc/ee.Jr.

Feb. 7, 1956 c. F. LINDEE, JR 2,733,741

COMBINATION LATILE AND DRILL PRESS Filed NOV. l0, 1953 4 Sheets-Sheet 2Invenor Cal'/ F. inc/ee, Jr.

Feb. 7, 1956 c. F. LINDEE, JR 2,733,741

COMBINATION LATHE AND DRILL PRESS Filed Nov. l0, 1953 4 Sheets-Sheet 3fnvenor Cczr/ F. Ll' dee, Jr;

CMQ/k Feb. 7, 1956 C, F, LINDEE, JR 2,733,741

COMBINATION LATI-IE AND DRILL PRESS Filed' Nov. 10, 1953 4 Sheets-Sheet4 lum j "i [n1/en for United States Patent O ce coMrNArroN LATHE ANDDRILL rnnss Carl F. Lindee, Jr., Chicago, Ill., assignor to PortableElectric Tools, Inc., Chicago, lll., a corperation of linois ApplicationNovember 10,1953, Serial No. 391,336

Claims. (Cl. 1441) This invention relates to multiple purpose machinetools adapted for wood-working and like operations and wherein the basicelements of the tool are adapted for rearrangement and readjustment soas to adapt the basic tool for the performance of many different typesof Work-performing operations.

In the past there have been many different kinds of multiple purposemachine tools adapted particularly for performance of a variety ofwood-working operations, and most of these prior tools have beenintended and adapted for use as a lathe, as a vertical drill press, andfor association therewith of various attachments whereby still furthertypes of wood-working, finishing and like operations might be performedthrough the'use of the basic elements of the tool. Most of the priormultiple purpose tools of the aforesaid kind have been relativelycomplicated and expensive, so that the tools have not been the subjectof wide distribution or use. It is therefore an important object of thepresent invention to simplify the structure of multiple purpose machinetools and to utilize the basic elements thereof with greater efficiency,thereby to reduce the manufacturing cost of such tools and enable awider market to be reached.

Other and related objects are to afford an improved multiple purposetool ofthe aforesaid character in which the basic elements are sorelated and associated that a high degree of strength and rigidity maybe attained in the tool through the use of a minimum of material.

Other and more specific objects of the present invention are to improvethe structural forms and relationship of the elements of such a multiplepurpose machine tool, 'to simplify the mounting and use of the tool, tosimplify the mounting and adjustment of the various parts andattachments on and with relation to the basic elements of the multiplepurpose tool, and to afford such a multiple purpose machine tool that isunusually well adapted for economical manufacture and for convenience ofuse and operation. Y

Other and further objects of the present invention will be apparent fromthe following `description and claims and 4are illustrated in theaccompanying drawings which, by way of illustration, show a preferredembodiment of the present invention and the principle thereof and what Inow consider tobe the best mode in which I have contemplated applyingthat principle. Other embodiments of the invention embodying the same orequivalent prin- -ciple may be used and structural changes may be madeas desired by those skilled inthe art without departing from the presentinvention and the purview of the appended claims.

in the drawings:

Fig. 1 is a plan View of a multiple purpose tool embody ing the featuresof the invention, the tool being located in v the relationship whereinit is adapted for use as a lathe;

Fig. 2' is a frontelevational view of the tool;

Fig. 3 is a rear elevational view of the tailstock taken from the line 33A of Fig. vl;

Fig. 3A is an elevational view, .taken partially in longi- 2,733,741Patented `Feb. 7, 19156 tudinal section, and showing the tailstock shaftor ram; Fig. 4 is a vertical sectional view taken substantially alongthe lines 4 4 of Figs. 1 and 3;

Fig. 4A is a cross sectionalfview taken substantially along the line 4A4A of Fig. l;

Fig. 5 is a cross sectional view taken substantially along the line 5 5of Figs. l, 2 and 3;

Fig. 6 is a left hand end elevational view of the headstock taken Vfromthe line 6 6 of Fig. l;

Fig. 7 is a right hand end elevational View of the headstock taken fromtheline 7 7 of Fig. 1;

Fig. 8 is a plan section of theheadstock taken substantially along theline 8 8 of Fig. 6;

Fig. 9 is a vertical sectional View of the headstock taken substantiallyalong the lines 9 9 of Figs. 6 and 8;

` The general organization For purposes of disclosure, the invention isherein illustrated as embodied in a multiple purpose machine tool 2nwhich is adapted for use as a lathe when the parts are arranged as shownin Figs. l to 4, or for use as a vertical drill press when the parts arearranged as shown in Figs. l0, ll and l2, and which, through theassociation of various attachments, may be utilized for other kinds ofworking operations such as have heretofore been performed with lathes orwith other specialized tools. Since the tool 2% may function as a lathe,the structural elements will be described herein as applied to suchfunctioning, but it is to be understood that the terms thus` employedare not used as terms of limitation since the various elements may havedifferent functions in different uses and adjusted relationships of thetool;

Thus the multiple purpose machine tool 20, as herein shown, comprises aheadstock 21 and a tailstock 22 adapted` for mounting on a supportingsurface 23v such as a bench, and adjustably connectedtogether by means.in cluding a pair of parallel connecting bars 25` that are made fromsteel and are ofv circular cross section and which are related to theheadstoc 21 and the tailstock 22 in a particular manner, as willhereinafter be described in detail.

The headstock 21 under/the present invention isadapted to removablyreceive and position a power source that is afforded by a conventionalportable electrically operated drill Z6 that is so located on and withrespect to the headstock 21 that the conventional screw-threadedoutputshaft ZS of the drill 26 constitutes the headstock spindle of the tool.This headstock spindle` 26S that is thus afforded is arranged so that itmay receive a driving spur center or headstock center 27 which is, inthe assembled relation of the tool 2i), aligned with a tailstock or deadcenter 23 that is removably mounted as by threading at 29T on atailstock shaft 29 that is mounted in the tailstock 22. v

The structure of the headstockV 21 is described in detail in mycopending application, Serial No. 391,268, filed November l0, 1953, andreference may be had to such copending application for further detailsof .such structure, but it may be pointed out that the headstock 21 isformed from a pair of end plates or castings 21F and 21R that are heldin a spaced relationship by an internal spacing bracket 30 that isVsecured to the inside faces of the end castings` 21F and 21R. The endcastings 21F and 21R have bottom surfaces 31 formed thereon and definedby mounting flanges 31F, and these `mounting surfaces 31 are disposed`in a plane that is parallel 2,733,741- f Y f f Y, n n

to the axis of the headstock spindle, and such surfaces 31 Y are adaptedto rest upon a mounting surface such as the bench 23. The headstock maybe secured to the mounting bench by fastening means not'shown, passeddownwardly through slots 32 formed in the edges of the flanges 31F, asshown in Fig. lof the'drawings.

The tailstock 22 is formed with a mounting surface 33 that is parallelto the axis of the tailstock shaft 29, and for purposes that will appearhereinafter, the tailstock 22 also has a mounting surface 34 at itsright hand end, as shown in Figs.V l and 2, such mounting surface beingperpendicular to the surface 33 and the axis of the tailstock shaft 29.This provision of surfaces 33 and 34 at right angles toeach otherenables the tailstock 22 to be mounted in the position shown in Fig. 2with the axis of the tailstock shaft 29 in a horizontal position, or tobe mounted in the position shown in Fig. of the drawings wherein theaxis of the tailstock shaft 29 is disposed in a vertical relationshipwith respect to the mounting bench 23. This changing of the position ofthe tailstock and the related elements serves to lit the tool for use asa lathe, as illustrated in Figs. 1 and 2, or for use as a verticalpress, as shown in Figs. 10 to 12, and the movement of the tailstockbetween these positions is preferably facilitated through the provisionof a pair of oppositely projecting coaxially pivot pins 35 disposed atthe juncture of the surfaces 33 and 34 and extending beyond the sideedges of the tailstock 22, as shown in Fig. 2. These pivot pins 35 maythus be held in a predetermined relation to the mounting surface 23v bymeans such as securing clips 36 that embrace the pivot pins 35 and whicharesecured to the bench 23 by means such as screws 37.

The edge of the tailstock 22 on which the pivot pins 35 are formed inthus held in the proper location, and when the tailstock is in theposition shown in Fig. 2, the opposite or left hand edge of thetailstock may be held in engagement with the bench 23 by means such as arotatable fastener 38 secured by a Vertical screw 39 to the bench 23 andadapted by rotation about the axis of the screw 39 to be placed in orremoved from an overlying or holding relationship with respect to anedge or ange portion of the tailstock 22. The secure mounting of thetailstock 22 in its different relations is also facilitated by edgenotches 33N and 34N formed respectively in the plates 33P and 341),these notches being used to receive fastening screws where this isdesired.

The connecting rods 2S are preferably of circular cross sectional formand may be in the form of hollow or solid metallic rods. As hereinshown, these rods are of solid cross section and are disposed in spacedparallel relationship so as to be located in a vertical plane thatpasses through the axes of the headstock spindle 26 and the tailstockshaft 29, and such rods are parallel to the lower surfaces 31 and 33 ofthe headstock 21 and the tailstock 22. As will be pointed outhereinafter, this relationship is important in that it imparts a highdegree of rigidity and strength to the tool for resisting the majorforces that come into play in the use of the tool. Such rods 25 serve,of course, to afford an adjustable connection between the headstock 21and the tailstock 22 and to position and locate these elements withrespect to each other, and the rods 25 also serve as a mounting meansfor additional'elements of the tool such as a steadyrest t0 that isadjustably secured on the rods 25 by means including an adjustablemounting bracket 41.

The headstock The details of the headstock 21 are described and claimedin my aforesaid copending application, but it will be observed in Figs.l, 2 and 6 to 9 of the present drawing that the headstock 21 is formedfrom a plurality of separately formed parts, including the end castings21R and 21F. Thus, these end castings are joined together in the desiredendwise spacing and in rigid relationship bythe connecting bracket thatis made in the form of a casting to atord a relatively heavylongitudinal bar 30B and transverse vertically positioned end walls SlWthat are braced with respect to the bar portion 30B by means oftriangular webs 30X. End castings 21R and 21F are adapted to be securedto the open end webs 30W of the spacing bracket 30, and for thispurpose, the end castings have projecting pads .46 on their inner facesthat are adapted tol bear against the opposed flat sur faces of the endwebs 30W. Four such pads 46 are provided in the present instance on eachend casting, and bolts 47 are extended through the pads so that they mayextend somewhat loosely through locating notches 48 that are formed inthe upper and lower edges of the end webs 30W. Nuts 47N are threadedonto the bolts 47, and after establishing the desired accurate relationbetween the end castings and the bracket 3i), the nuts 47N are tightenedso as to clamp the end webs 30W against the pads 46 and thus secure theend castings 21R and 21F in the rigid and accurately establishedrelationship with respect to the spacing bracket 30. It will be notedthat the spacing rods 25 extend through opening 25H in the end castings21F and 21R, and similar openings are provided in the end webs 30 W ofthe spacing bracket The castings 21R and 21F have bottom flanges 31F ashereinbefore described, and these anges each have a pair o-f mountingnotches 31N formed therein through which mounting or securing screws maybe extended into a bench or mounting board when independent mounting ofthe headstock 21 is desired. The castings 21R and y 21F have verticallyextended walls that are curved at their front and rear edges, asindicated at 49, so as to add strength to these castings, and this isparticularly important since the connecting bracket 3Q is associatedwith the end castings 21F and 21R relatively close to the lower edgeportions of these castings. At their upper edges, the end castings arealso curved as at Si), and this results in a pleasing appearance in theexposed surfaces of such castings. l

Between the end castings 21R and 21F a forward wall portion of theheadstock 21 is'aiorded through the provision of a relatively thin sheetmetal cover plate 51 that extends between the end castings and islocated with its vertical edge edge portions in outwardly facingrabbeted grooves 52 that are formed along the upwardly and rearwardlyextending edges of the forward sides of the end castings. At the loweredges of these castings, the edge of the cover sheet 51 is bent inwardlyand upwardly as at 51A, Fig. 6, about the lower ends of the anges thatalford the rabbeted grooves 52, while the upper edge of the cover plate51 is bent downwardly into a locking relationship as at 51B, it beingnoted that the flanges that form the rabbeted grooves 52 terminate atthis upper point to afford end edges about which bending of the coverplate 51 may bevaccomplished.

The spacing bars 25 are adjustably clamped to the connecting bracket 30of the headstock 21, and this is accomplished by extending a clampingbolt 54 horizontally and in a rearward direction through the bar portion30B so that this bolt will pass between the bars 25 in an equally spacedrelation thereto. At its forward end, the head 54H of the `bolt'5'4 isdisposed between a pair of ribs 55, as shown in Figs. 8 and 9, so as tohold the bolt against rotation, and at its threaded rear end, a clampingbar 56 of U-shaped cross section is placed over the bolt so thatcomplemental upper and lower side edge portions of the clamping bar 55will embracingly .engage the rear faces ofthe two bars 25. A clampingnut 57 threaded on to the rear end of the bolt 54 may be rotated bymeans of a cross bar 58 to clamp the bar 56 against the two rods 25, andthis serves to adjustably position the headstock 21 with respect to thebars 25.

Y Means are afforded on the headstock 21 for locating an electric drill26 accuratelyY in such a position that the ,output shaft of thedrillconstitutes aheadstock spindle,

and in accomplishing this, means are afforded on 'opposite ends of theheadstock for engaging the drill and positioning the same with `respectto the headstock. In respect to the end casting 21F, such locating meansare afforded by providing a circular opening 60 that has an annularrabbeted groove 60R defined aroundits inside surface, and this opening60 and the groove 60R are made substantially larger than the largestbearing hub 26H, Fig. 2, that would normally be encountered inconventional electric drills. These bearing hubs 26H take differentforms in drills manufactured by different manufacturers, and asdescribed ink detail in my aforesaid copending application, means areaffordedfor enabling different sizes and different shapes of suchbearing hubs to be accurately centered with respect to the opening 60.'

`This is accomplished through the provision of a separately formed ring62 that has its outer annular surface shaped complemental to vthegroove60H, and the inside surface of the locating ring 62 has its surface 62Bformed to accurately engage the outer surface of the hub 26H of a drillin such a way that the output shaft of the drill will be coaxial withthe outer annular surfaces of the ring. Hence, when the ring 62 supportssuch a hub in the rabbeted groove 60R, the forward end of the drill isaccurately centered upon the axis of the opening 60 so that the outputshaft of the drill may constitute the headstock spindle.

At the other or rear end of the drill, the requisite centering isafforded by clamping means that are arranged to clampingly engage andaccurately locate the rear end of the drill through cooperation withsuitable locating surfaces on the rear end of the ldrill 26. As hereinshown, such clamping means cooperate with locating surfaces afforded bya projecting headed screw or stud 65 that may be mounted in a threadedopening that normally is provided in such drills in accurate alignmentwith the axis of the output shaft of such a drill. This added stud 65has a tapered center hole'formed therein, and the clamping means `arearranged to .engage this center hole, as will be described hereinafter.

To accommodate the handle portions of the drill, the end casting 21R iscut outas at 66, and this cut out portion is arranged to have arearwardly extending, upwardly facing lower surface 67 that affords ashoulder against which one side surface of the handle 126 of the drillmay engage, as shown in Fig. 6 ofthe drawings, thus to afford aneccentrically located reaction point for the rotative forces that areapplied ina counterclockwise direction, Fig. 6, when the tool isoperated. It will be evident that in this location the controllingtrigger 26T of such drill will beV readily accessible, and that thetrigger lock 26L will also be extended upwardly and will be readilyaccessible to the user, as shown in Figs. l and v6 of the drawings.

The clamping and locating `means for the rear end of the drill areafforded by a clamping bar 70 that is mounted on the projecting end of astationarily located clamping bolt 71. The headed inner end of theclamping bolt 71 is located between and held against rotation by ribs 72Vformed internally on the` wall of the bracket 21R, and this boltextends through the center point of the clamping bar 70 `and has aknurled clamping nut 73 threaded thereon. Where the bar 70 is tocooperate with the center hole` of a stud 65 or the like, the oppositeends of the clamping bar 70l1ave extending centering pins 70S and 70Lformed respectively thereon and these centering pins are of differentlengths and have conical ends for purposes that will appear'hereinafter. j One of the centering pins is adapted to be engaged lwitha center hole 74 that is formed `in the outer yface of the end casting21R in the plane of the bars 25, andit should also be observed that theclamping bolt 71 is also in this plane. Hence, when the lower one ofthecentering pins is located Vin the `center hole 74, the upper one ofthese pins willbe locatedin this same plane, andthe rlength of theclampingbar 70 and the spacing of the centering` pins are such thatunder the circumstances described, the upper one ofthe centering pinswill also be located on the axis that is desired for the headstockspindle. will be recognized of course that where the upper end of thebar 70 is to cooperate with differently formed and dierently positionedlocating surfaces `on a `drill 26, the

upper end of the bar 70 may be provided with differently formedengaging, means complemental to the locating surfaces that are to beengaged. When the clamping nut 73 is tightened, the endwise forcesapplied to the drill 26 lare transmitted to the locating ring 62 and tothe rearwardly facing surface of the annular rabbeted groove 60G.

The provision of two different lengths for the centering pins 70S and701?. enables different lengths ofdrills to be readily and easilymounted in the headstock, and it should be observed that the clampingbar 70 is relatively small so that it will extend into the hand openingof a saw-drill where such drill is to be mounted in the headstock. Whilethe use of different lengths ofl centering pins on the clamping bar 70enables a limited variation or difference in the length of the drillsthat may be mounted in the headstock, it should be observed that thespacing bracket 30 and the cover plate 51 are the only elements thatrequire change where other lengths of drills need to be mounted in theheadstock. This simplifies manufacturing and inventory problems.

The tailstock The details of `structure of the tailstock` 22`V are shownin Figs. 3 to 5 of the drawings, wherein it will be evident that thesurface 34 ofthe headstock is formed by a plane 34T which constitutes anintegral part of the tailstock casting, while the other surface 33 isformed by what may be termed a discontinuous plate-like structure 33p,and these two plates 33P and 34P are rigidly interconnected by astructure which affords positioning and clamping surfaces for the rods25 as well as an elongated generally cylindrical mounting and guidingsleeve 75 for supporting the tailstock shaft or ram 29. The'sleeve 75has a longitudinal bore 75B formed therein that of course extendsparallel to the plate 33P and is located a substantial distance upwardlyfrom the plate 331), as shown in Figs. 3, 4 and 5. One end of `thesleeve 75P "is supported by and cast integrally with` the plate 34P,

while throughout its length, the sleeve 75 is supported by a web-likefront wall 76 that extends upwardly and rearwardly from the forwardportion of the plate SBP, this wall 76 being joined integrally with theplate 34P throughout its entire upward extent. vAt the'other, or rightend of the wall 76, as viewed in Fig. 3, an upwardly extending partialend wall 77 is formed integrally with the sleeve `75 and the adjacentend of the wall 76, and this serves further to impart rigidity to thesleeve 75.

Within the space defined by the plate 34P, the front wall 76 and thepartial end wall 77, means .are afforded for accurately locating therods `25. Thus, as shown in Figs. 3, 4 and 5, a horizontal web 78 isextended rearwardly from the inner face of' the wall 76 at a levelslightly above the level of the upper rod 25, and just forwardly of thelocation of the rods 25, adownwardly extending wall 79 is provided whichis joined integrally at its upper and lower ends with the web 78 and theplate SSP, as best shown in Fig. 5. Adjacent to its ends, the wall '79has formed pads Si) formed thereon which have longitudinal grooves 80Gformed therein that are complemental to the outer surfaces of the rods25, and the location of the Vrods with respect to the tailstock isadjustably fixed by clamping of the rods 25 against the surfaces orgrooves 80G. Such clamping is accomplished by means including a clampbari82 that is of U-shaped cross section and is identical with the clampbar 56 hereinbefore described. Thisclamp Abar 82vhas3clamping notches82N formed in positions for engagement with the sides of the two rods25, and arclarnpin'g bolt 83 extends rearwardly through the wall '79,between the two rods 82 and through a central opening in the clamp bar62 so that a clamping nut 84 with an operating cross bar 85 may bethreaded onto the clamping bolt 85 for clamping the clamp bar 82 againstthe rods 25.

' In the xing of the work piece between the headstock andtailstockcenters, and for other purposes as will be described, thetailstock shaft or ram 29 must be moved longitudinally in its mountingbore 75B, and to enable this to be done, an operating handle 36 isprovided on the tailstock. -At its lower end, the operating lever 86 hasYa slot 86S formed longitudinally therein, and this slot embraces areduced portion of the clamping nut 84 which thus forms a fixed pivotalcenter for the lower Vend of the operatingl lever 86. The lever 86extends upwardly and along an elongated clamping pad 7e? that is formedon the rear face of the mounting sleeve 75, and this pad 75P has anelongated slot 75S formed therein which opens through the pad '75P andinto the bore 75B. Near its rear end, that is, its left hand end asviewed in Fig. 3A of the drawings, the tailstock shaft or ram 29 has ascrew threaded opening 29S extending radially thereinto, and a headedclamping bolt 88 is extended through an opening 86A in the handle 86 andis threaded into the opening 29S. The clamping screw S8 has a head 88Hand a cross bar 88B, and the bolt SS serves to transmit movement fromthe operating lever 36 to the tailstock shaft or ram 29. Thus the ram 29may be moved longitudinally from the fully retracted position shown infull lines in Fig. 3 to or toward an extended position that is shown indotted lines in Fig. 3, and when it has reached the desired position oflongitudinal adjustment, it may readily be fixed in this position bytightening the clamping bolt 88 which serves to clamp the lever 36firmly against the opposed flat surface of the pad 75l.

The lever 86 is utilized in this manner in clamping and releasing thework between the headstock and tailstock centers, and is also used inraising and lowering the work on a suitable work table when the tool isused as a verti- `cal drill press, and this aspect of the structure willbe described in detail hereinafter.

The steadyrest The steadyrest 40 is adjustably supported on the rods 25by means of the bracket 41, and the details of this bracket and thesteadyrest are illustrated in Figs. l, 2 and 4A of the drawings. Thus,the bracket 41 comprises an angular casting that has a horizontal arm41H and a vvertical arm 41V that extends downwardly from the horizontalarm 41H. The vertical arm 41V has its rear surface formed withhorizontal arcuate grooves 141 therein in spaced relation so that thesegrooves will tit against and embrace'the forward side surfaces of therods 25, and a clamping bolt 90 extends rearwardly through the arm 41Vand between the two rods 25. A clamping bar 91 that is identical withthe clamping bars 56 and 82 hereinbefore described is placed over therear end of the bolt 90, and a clamping nut 92 having a cross bar 95 isscrew threaded onto the projecting rear end of the bolt 90. The nut 92may thus be tightened toV clamp the bracket 41 in any desired positionalong the rods 25.

The forwardly projecting arm l1H of the bracket 41 has a longitudinalslot 1418 formed therein, and on one Lbepositionedin any '.one ofthevertically extending grooves 141G; thus to locate the steadyrest 40securely in any desired spacing forwardly'of the working axis of thetool. VThe rod 40R is adapted to be clamped in any one of the grooves141G and is adapted to be clamped in any desired vertical position ofadjustment with respect to such grooves. In accomplishing this, a splitclamping block 95Y is placed in an embracing relationship with respectto the rod 40H, and across the split side of the block 95, a clampingscrew 96 is provided whereby the clamping block may he clamped in anydesired vertical position along7 the rod 40B, and such clamping servesto hold the rod MPR against rotative displacement in and with respect tothe clamping block- 95.

The clamping block 95, at the edge thereof that is opposite from thelocation of the screw 96, has a screw threaded opening formed therein,and a wing headed clamping screw 97 lextends through the slot 1418 andinto this screw threaded opening'.4 lt should also be observed in Fig. 2of the drawings that the arm 41H is U-shaped or channel-like in form,and this channel opens to the right in Fig. 2 of the drawings. The edgeof the clamping block 95 that is engaged by the clamping screw 97 isarranged to extend into this channel, and it will be observed that whenthe clamping screw 97 is tightened, the rod 0R will be clamped tightlyin the notches or grooves MiG, and the block will beheld rmly againstany undesired angulary displacement which might cause the steadyrest lilto assume an improper position with respect to the other elements of thetool.

The magnetized clamping bars The assembly and adjustment of the elementsof the present tool are materiallyrsimplied by so constructing theseveral clamping structures so that the assembly of the clamping devicesmay be readily and easily performed. Thuswith respect to the clampingbars 56, S2 and l, provision is made under the present invention wherebysuch clamping bars will be magnetically held in place while the relatedclamping bolts, brackets and clamping nuts are put in place. While thisresult may be accomplished by magnetizing the steel rods 2S, or byassociating these rods with opposite poles of a permanent magnet, Iprefer to attain the result by magnetizing the individual clamping bars.These clamping bars 56, 82 and 91 are made from a magnetizable ferrousmetal. and have engaging surfaces complemental to the surfaces of thesteel tie rods 25, and such clamps are magnetized so that when theseformed engaging surfaces are put in place against the rods 25, aneffective magnetic path is provided therebetween and the clamping barswill be held in place. The user then has both hands free for holding andmanipulating the clamping bolt and nut.

The use as a vertical drill press With the structure that is thusafforded, it will be evident that the tool may be shifted readily to anupright position that is shown in particular in Figs. l0 and ll of thedrawings, and to enable this to be done, it is merely necessary toadjust the rods 25 so that the right hand ends thereof are locatedwithin the tailstock 22, and to release the holding member 38. may thenbe rocked to the upstanding position shown in Figs. l0 and 1l, andadditional rotatable fasteners 101 which are similar to the fastener 38may be rotated into position as shown in Figs. 1l and 12 to maintain thetool in its upright position. In such upright position, the tool mayreadily be adapted for the performance of vertical boring and similaroperations. This is done by removing the headstock center 27 andreplacing it with the usual chuck such as the gear chuck 102 shown inFigs. l0 and l1, and in this respect it is to be observed that suchchuck 102 is merely rotated upon the threaded portion 26S of the outputshaft of the portable drill 26. The chuck -102`serves to support a drillbit 103,

The entire tooland awork piece such as the work piece W'may be mountedon a table structure 104 which may be in" the form of a conventionalface plate that is adapted for other uses in connection with the presenttool. This face plate 104 is mountedon the screw threaded end 29T g ofthe ram 29, as will be evident in Figs. 10 and 1l of Structuraladvantages In the tool structure that has been described hereinabove, ithas been found that exceptional and unexpected rigidity of the workingelements of the tool has been attained, and this has been accomplishedwithout embodying` unduly large structural members in the tool. Thus ina tool of this character, one'of the important considerations insofar aswork-performing capacity may be concerned is the throat dimension orswing, and this dimension constitutes the distance between the worksupporting axis of the tailstock and headstock and the closestconnecting member such as the upper connecting member 25. In the past,it has been the practice to place connecting rods between the headstockand tailstock in a horizontal plane, rather than in a vertical planepassing through the headstock and tailstock axis, and in such priorstructures, it has been necessary to utilize extremely or unduly largeconnecting members or rods for this purpose; With the presentstructure,.it has been found that where a particular size of connectingrod has been placed in a vertical plane under the presentV invention,the resistance to the normal distorting forces is substantially sixtimes that which can be attained by the same size `of rods disposed in ahorizontal plane and at the same meansthat are-to beeffective--betweenthe rods and the various elements of the-tool maybe located in aconveniently accessible manner in each instance.V

' `Such'lo'cation of the tie rods 25 in a vertical plane also results`in a physical form in the major elements of the` tool-which facilitatesthe formation of these elements by conventional"processes"of casting.Thus, with re- `spect to the connecting bracket 45 of the headstock,

the clamping surfaces for cooperation without tie rods 25 may be readilyand easily formed, while in the tailstock, the location of the tie Vrodsenables rearwardly facing positioning surfaces to be utilized on therear face of the wall structures of the tailstock, and this simplifiesthe casting problems, while at the same time enabling a highlyattractive forward face to be afforded on the tailstock.

Further structural advantages of the present structure reside in theconvenient convertibility of the tool from a lathe to a verticaldrillpress.

It will be evident that the headstock 21 may be readily associated withspacing rods such as the rods 25 to connect the headstock with atailstock in the manner herein described, but it should also be observedthat by reason of the mounting flanges 3lF and mounting notches 31N, thepresent headstock may be supported or mounted independently of thespacing rods 25. This enables the present headstock to be mounted inwidely spaced but aligned relationship with respect to a tailstock, orto be mounted independently of a-tailstock for use in sanding, buing,grinding and like operations.

Conclusion From the foregoing description, it will be apparent that thepresent invention materially simplifies the structure-*of multiplepurpose machine tools, and enables the basic elements of such a tool tobe utilized withgreater efficiency and in such a way as to materiallyreduce the manufacturing cost of such tools.` More specifically, it isto be noted that the present invention affords a multiple purpose toolwherein the basic structural elements are -so related that a high degreeof strength and rigidity is attained through the use of a minimum ofmaterial.

Thus, while I have illustrated and described the preferred embodiment ofmy invention, it isrto be understood that this is capable of variationand mo-diication, and therefore do not wish to be limited to the precisedetails set forth but desire to avail myself of such changes andalterations as fall within the purview of the'following claims. Y

I claim:

Vl. In a multiple purpose machine tool of the character described, aheadstock and a tail'stock each having a mounting base surface formounting the same directly on a bench or the like, meanson saidheadstock defining a headstock spindle axis parallel-to and spaced apredetermined distance from the base surface of the headstock, means onsaid tailstock defining a tailstock center axis parallel to and spacedin the same predetermined distance from the base surface of saidtailstock, a pair of laterally spaced parallel spacing rods extendingthrough said headstock and said tailstock parallel to and equally spacedfrom both of said axes and ina plane that is perpendicular to said basesurface and passes through said axes, said headstockand tailstock eachhaving positioning surfaces thereon for engagement with such rods tolocate the rods with respect to said headstock and tailstock, andreleasable clamping means for clamping said rods against'suchpositioning surfaces, said headsotck includinga power motor having ashaft coupling on said spindle axis adaptable for receiving selectivelya spindle or a drill bit clutch and said tailstock including a ramreciprocally mounted on its center `axis and having an end shaftcoupling adapted for receiving either ay spindle or a drill press table,an outer face on said tailstock normal to its base surface, saidtailstock being hinged to the bench at the outer end of said' basesurface at the intersection thereof with said outer face, andclampingmeans for clamping either said base surface orsaid outer face tosaidbench selectively afterswingingthe tool about said hinge to thecorresponding positionon the bench, whereby ,the tool is adapted for amultiplicity of uses withoutsacricing'rigidity and simplicity. v

2.. Ina multiple purpose machine tool of the character described, aheadstock and a tailstockeach .having a mounting surface affording amounting base adapted to rest solidly and in an accurate relation on abench or the like, means in said headstock aiording a headstock spindleparallel to and spaced a predetermined distance from said mountingsurface thereof, means in said tailstock aifording a reciprocablymovable tailstock ram shaft parallel to and spaced in the samepredetelmined distance from said mounting surface of said tailstock, apair of spacing rods disposed in a plane perpendicular to said Vsurfacesand passing through the axis of said headstock spindle and saidtailstock shaft and said rods being extended through said headstock andtailstock in an adjustably clamped relationship thereto, said tailstoclt'naving a second mounting surface located perpendicular to the firstmentioned mounting surface of such tailstock and perpendicular to theaxis of said tailstock shaft adapted to rest on such a bench or the likeand locate said tailstock ram in a vertical position, and pivottrunnions formed in oppositely projecting relation on said tailstock atvsubstantially the intersection of said mounting surfaces of saidtailstock.

3. In a tailstock structure for use in a multiple purpose tool, a pairof integrally formed plates positioned at right angles to each other andhaving oppositely projecting trunnions at the intersection of suchplates, a

I`1 mounting sleeve disposed parallel to and spaced substantially fromone of said plates and perpendicular Vto and integral at one of its endswith the otherof said plates, a front wall extending upwardly from thefirst mentioned of said plates and connected at its edges with both ofsaid plates and with said sleeve, al partial end wall extended from saidforward wall at the edge of such forward wall that is remote from saidother plate to rigidly support said sleeve in parallel relationship tosaid first mentioned of said plates, and integral wall means rearwardlyof said forward Wall and connected integrally with forward wall and withsaid iirst mentioned plate and affording rearwardly facing positioningsurfaces against which a pair of tie rods may be clamped inpredetermined relationship to said sleeve.

4. In a tailstock 4structure for use in a multiple purpose tool, firstand second integrally formed plates positioned at right angles to eachother and having oppositely projecting trunnions at the intersection ofsuch plates, a mounting sleevel disposed parallel to and spacedsubstantially from said rst plate and perpendicular to and integral atone of its ends with said second plate, a front wall extending upwardlyfrom Vsaid first plate and connected at its edges with both of saidplates and with said sleeve, a partial end wall extended from saidforward wall at the edge of such forward wall that is remote from saidsecond plate to rigidly support said sleeve in parallel relationship tosaid iirst plate, integral means including a vertical rear wall disposedrearwardly of said forward wall and connected integrally with saidforward wall and with said first plate and aifording rearwardly facingpositioning surfaces against which a pair of tie rods may be clamped inpredetermined relationship to said sleeve, a clamping bolt extendedrearwardly through said rear wall, a clamp bar on said clamping bolt, afirst elongated clamping nut on said clamping bolt for applying clampingforces to said clamp bar, a tailstock ram mounted in said sleeve forreciprocation therein, said sleeve having a longitudinal slot formed inits rear side, a clamping screw extended through said slot and into saidram to serve as a laterally projecting connection for transmittinglongitudinal movements to said ram, said clamping bolt having a secondclamping nut thereon, an actuating lever having a circular opening and alongitudinal slotted opening formed therein at spaced points, one ofsaid openings embracing said rst elongated clamping nut, and the otherof said openings embracing said ram clamping screw whereby said clampingscrew may clamp said lever against said sleeve to hold said ram in anydesired longitudinal position in said sleeve.

5. In a tailstock structure for use in a multiple purpose tool, a pairof integrally formed plates positioned atright angles to each other Yandhaving oppositely projecting trunnions at the intersection of suchplates, a mounting sleeve disposed parallel to and spaced substantiallyfrom one of said plates and perpendicular to and integral at one of itsends with the other of said plates, a front wall extending upwardly fromthe first mentioned of said plates and connected at its edges with bothof said plates and with said sleeve, a partial end wall extendedrearwardly from said forward wall at the edge of such forward wall thatis remote from said other plate to rigidly support said sleeve inparallel relationship to said iirst mentioned plate, integral wall meansrearwardly of said forward wall and connected integrally with saidforward Wall and with said first mentioned plate and aording rearwardlyfacing positioning surfaces against which a pair of tie rods may beclamped in predetermined relationship to said sleeve, a clamping boltextended rearwardly through said integral wall, a clamp bar on saidclamping bolt, an elongated clamping nut on said clamping bolt forapplying clamping forces to said clamp bar, a tailstock ram mounted insaid sleeve for reciprocation therein, said sleeve having a longitudinalslot formed in its rear side, a clamping screw extended through saidslot and into said ram for transmitting longitudinal movements to saidram, an actuating lever pivoted on said last'mentioned clamping screwand having a longitudinal slot embracing said elongated clamping nut anda clamping shoulder on said ram-clamping screw for clamping said leveragainst said sleeve to hold said ram in any desired longitudinalposition in said sleeve.

References Cited in the le of this patent UNITED STATES PATENTS 907,418Sheldon Dec. 22, 1908 966,253 Smith Aug. 2, 1910 1,637,654 Perez Aug. 2,1927 1,733,208 Schimmel Oct. 29, 1929 2,049,191 Bouget July 28, 19362,200,799 Miller May 14, 1940 2,226,029 Taylor Dec. 24, 1940 2,492,783Chamberlain Dec. 27, 1949 2,623,269 Goldschmidt Dec. 30, 1952 FOREIGNPATENTS 620,276 Great Britain Mar. 22, 1949

